[DeTomaso] ac

[SEL]

hey all - recently switched to a newer ac compressor - apparently I need a "dryer" - is this a Napa purchase (or P specialty item) - part #? I am told that the existing ac lines and seals, o-rings, etc are set for R12, which requires less tight seals because it has a bigger molecular structure (don't ask - i am just the messenger) - so do you think it makes sense to refill with R12 with the hope of long time before refill? or use 134 in the existing set up and refill frequently? or change over more of the system to accomodate 134?  Can any of the Houston boys recommend a good a/c shop to do this (or is this a do it yourself project with a can of freon?)?  Many thanks, Stephen